Lexical Definition

‎מֵחַ‎ mêach (may'-akh) fatling H:N-M
from ‎מָחָה‎ in the sense of greasing

fatling (one).

1) fatling, fat one

Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
מֵחִ֣ים fatlings Ps.66.15
מֵחִ֖ים fatlings Isa.5.17

Brown-Driver-Briggs

[‎מֵחַ‎] noun [masculine] fatling (Phoenician ‎מח‎ fat (adjective ); Late Hebrew ‎מֵיחָא‎ figurative of choice flour); — only plural absolute: ‎עֹלוֺת מֵיחִים‎ Ps 66:15 burnt offerings of fatlings; so ‎מֵחִים‎ Isa 5:17 (|| ‎כְּבָשִׂים‎) according to Hi Du CheHpt (read ‎חֳרָבוֺת‎ and strike out ‎גָּרִים‎); most, fat ones, figurative for rich men.

Brown-Driver-Briggs References

Book Refs
Psalms 66:15
Isaiah 5:17